---
id: CVE-2026-91021
title: >-
  Trilium Notes, version v0.103.0 and earlier, contains a stored cross-site
  scripting (XSS) vulnerability in the share renderer for webView notes due to
  improper HTML escaping of user-controlled #webViewSrc values
summary: >-
  Trilium Notes, version v0.103.0 and earlier, contains a stored cross-site
  scripting (XSS) vulnerability in the share renderer for webView notes due to
  improper HTML escaping of user-controlled #webViewSrc values. This
  vulnerability allow…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
  - CWE-116
vendor: Trilium
product: Trillium Notes
affected:
  - trillium_notes <= v0.103.0
published: '2026-09-14'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T13:42:48.320'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91021'
references:
  - url: 'https://vokecyber.com/research/trilium-share-renderer-stored-xss'
    label: cret@cert.org
tags:
  - nvd
  - cve.org
epss: 0.00226
epssPercentile: 0.11829
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T19:41:10.009376Z'
ingestedAt: '2026-09-14T18:12:17.309Z'
---

## Overview

Trilium Notes, version v0.103.0 and earlier, contains a stored cross-site scripting (XSS) vulnerability in the share renderer for webView notes due to improper HTML escaping of user-controlled #webViewSrc values. This vulnerability allows attackers with note-authoring privileges to inject arbitrary JavaScript that executes for any user who opens the shared note, including administrators.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.